Question - Calories

Should I be netting 1,200 calories per day to lose weight or should I be netting less than 1,200 calories. I work out for about an hour per day, but I am only netting around 600-900 calories per day & seems like I am stagnant in losing weight. Do I have to fuel my body in netting 1,200 calories per day in triggering my metabolism to lose weight more rapidly and healthier? Thanks!